Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa88fa279eb10045…

MALICIOUS

PDF

69.9 KB Created: 2021-06-24 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a42aebf135974e92c616d6bf0cbd983 SHA-1: 72ad2fe7163ccaa7dd2a1d3f33c525a12dd85560 SHA-256: aa88fa279eb10045b54eea6c2587dc4eb3ece85559f408eb26fdd14189e36dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body text, though partially corrupted, contains a lure related to installing Adobe PDF reader, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://alarcon-v.com/editor_upload_image/file/gugokifekubiwilisasu.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa213766dac41b35ca4b9dc269b510c9/komiberemovofewin.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e9a3304631324ac212fdf6c3f5a224fe/betujusumukixenumomamemig.pdf
    • https://grandplaza.bg/uploads/assets/file/18502908639.pdf
    • http://amoy-art.com/Upload/file/45062146684.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2e202400448bdd73f29c81d724c4db3f/nukenadigedu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0f38f8e88bf7d6eb16118e1cfce2cda3/sibatikidizugezi.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/demewibewuzo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8qv423djimdo6d3g9vuequf1i1/1876561991.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/302c4434959a85115041535d613f26c8/59751936546.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2651da0f---tewux.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/livuge.pdf
    • https://angkortaxiservice.com/userfiles/file/90733321457.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozeti.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/denoziwajakaxox.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160789ed011223---28247964471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=install+adobe+pdf+reader+for+windows+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22e.bin
72b9efd78ec0cea8c9de491aeb0fd1e139e6f7531ccc72e664a5d82147e0d979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 5284 bytes
font_01_sfnt_off0000e44b.bin
555d58d7e3f66802a5c6de2314307541260b9418691552dca344b7fa702a0389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 11188 bytes

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